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Psychotic features, substance use, and personality disorders correlate with poor medication adherence in bipolar disorderFactors Linked to Poor Medication Adherence in Bipolar Disorder

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Key Takeaway
Note that psychotic features, substance use, and personality disorders are associated with poorer medication adherence.

This meta-analysis synthesized data from 19 studies to identify factors associated with poor medication adherence in patients with bipolar disorder. The analysis identified several significant associations: psychotic features (OR = 1.58), history of suicide attempts (OR = 1.36), and higher numbers of manic (SMD = 0.34) or mixed episodes (SMD = 0.16). Substance use was also linked to poor adherence, specifically cannabis use (OR = 2.34) and alcohol use disorders (OR = 1.71).

Additionally, comorbid conditions significantly impacted adherence: generalized anxiety disorder (OR = 3.70) and personality disorders (OR = 5.54) were strongly associated with poorer outcomes. Sociodemographic factors included younger age (SMD = -0.22), lower education levels (SMD = -0.34), and earlier age at onset (SMD = -0.29). Clinical indicators such as more hospitalizations (SMD = 0.53) and lower insight (SMD = -0.74) or global functioning (SMD = -0.60) also correlated with poor adherence.

The authors note that the evidence is generally weak due to small effect sizes, imprecision, inconsistency, and potential publication bias. These findings highlight the importance of targeted strategies to improve medication adherence in patients with bipolar disorder, particularly those with comorbid conditions or substance use issues.

How this fits prior evidence

This meta-analysis identifies several clinical and sociodemographic factors associated with poor medication adherence in bipolar disorder. While it does not directly address childhood adversity or rTMS interventions mentioned in prior coverage, it provides a broader context for the complexities of managing bipolar disorder by identifying specific patient profiles, such as those with psychotic features (OR = 1.58) or comorbid personality disorders (OR = 5.54), who may require more intensive adherence support.

Researchers analyzed 19 studies to identify what factors are associated with poor medication adherence in people living with bipolar disorder. The study looked at various factors including age, education level, substance use, and the severity of symptoms.

The findings showed that several factors were linked to lower adherence. These included being younger, having a lower education level, and experiencing an earlier onset of the condition. Additionally, patients who had more manic or mixed episodes, more hospitalizations, or higher levels of global severity were less likely to follow their medication plans consistently.

Other significant links were found with substance use, such as cannabis and alcohol, as well as co-occurring conditions like generalized anxiety disorder and personality disorders. Because the evidence was generally weak due to small effect sizes and potential inconsistencies, these results should be viewed as associations rather than certain causes. These findings highlight specific areas where doctors can focus on creating better support for patients.

What this means for you:
Several factors, including age, substance use, and co-occurring conditions, are linked to lower medication adherence.

Common questions

What personal factors are linked to poor medication adherence?

The study found that younger age, lower education levels, and an earlier age of onset were all associated with poorer medication adherence. Additionally, patients who were not in a relationship were more likely to have lower adherence rates.

How do other health conditions affect medication adherence?

The research showed strong links between poor medication adherence and certain co-occurring conditions. Specifically, having generalized anxiety disorder or personality disorders was associated with a higher likelihood of not following medication plans.

Do substance use habits impact how well patients take their medicine?

Yes, the study found that both cannabis use and alcohol use disorders were linked to poorer medication adherence. These findings suggest that substance use is a relevant factor for healthcare providers to consider.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedAug 2026
View Original Abstract ↓
OBJECTIVES: Poor adherence to psychopharmacological treatment may contribute to relapses in bipolar disorder (BD). We performed a systematic review and meta-analysis to identify factors associated with poor adherence in BD. METHODS: The protocol was registered in Open Science Framework Registries (https://doi.org/10.17605/OSF.IO/2KZFJ). We searched main electronic databases through March 2025. Random-effects meta-analyses were performed to obtain pooled odds ratios (ORs) and standardized mean differences (SMDs) for relevant correlates. RESULTS: We included 19 studies. Subjects with poor adherence were more likely to be younger (SMD = -0.22, 95% CI: -0.42--0.02) and to have lower education (SMD = -0.34, 95% CI: -0.55--0.12), and less likely to be in a relationship (OR = 0.54, 95% CI: 0.34-0.86). Moreover, earlier age at onset (SMD = -0.29, 95% CI: -0.53--0.04), psychotic features (OR = 1.58, 95% CI: 1.30-1.92), a history of suicide attempts (OR = 1.36, 95% CI: 1.03-1.78), a higher number of manic (SMD = 0.34, 95% CI: 0.08-0.61) and mixed (SMD = 0.16, 95% CI: 0.03-0.28) episodes, and more hospitalizations (SMD = 0.53, 95% CI: 0.32-0.73) all emerged as correlates of poor adherence. Also, cannabis (OR = 2.34, 95% CI: 1.79-3.07) and alcohol use disorders (OR = 1.71, 95% CI: 1.39-2.12), comorbid generalized anxiety disorder (OR = 3.70, 95% CI: 1.90-7.22), and comorbid personality disorders (OR = 5.54, 95% CI: 1.32-23.15) were associated with poor adherence. Finally, poorly adherent individuals had higher global severity (SMD = 0.21, 95% CI: 0.01-0.41), lower insight (SMD = -0.74, 95% CI: -1.08--0.41), and lower global functioning (SMD = -0.60, 95% CI: -0.87--0.34). No differences were estimated for other variables. CONCLUSIONS: This meta-analysis showed that poor adherence in people with BD is associated with specific correlates. Although evidence was generally weak due to small effect sizes, imprecision, inconsistency, and potential publication bias, our findings highlight the importance of strategies to improve adherence.
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